Main motor (M4) The main motor (M4) is a three-phase, eight-pole, brushless motor. This motor drives the rollers related to pick-up, feeding, fusing, and delivery. This motor also drives the transfer belt press drive cam and cleaning roller press drive cam. The controller board switches the motor speed between normal speed, 1/4 speed for OHT mode, and 1/3 speed for glossy or heavy media by combining the M4 speed change signals. Figure 52. Main motor (M4) EN Mechanical systems 175